{"product_id":"case-339-tudor-black-bay-gmt-opaline-ref-79830rb","title":"Case #339 — Tudor Black Bay GMT “Opaline” Ref. 79830RB","description":"\u003ch1 data-section-id=\"r1l5jg\" data-start=\"79\" data-end=\"139\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"81\" data-end=\"139\"\u003eCase #339 — Tudor Black Bay GMT “Opaline” Ref. 79830RB\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp data-start=\"141\" data-end=\"264\"\u003e\u003cstrong data-start=\"141\" data-end=\"152\"\u003eStatus:\u003c\/strong\u003e Active Investigation\u003cbr data-start=\"173\" data-end=\"176\"\u003e\u003cstrong data-start=\"176\" data-end=\"190\"\u003eCondition:\u003c\/strong\u003e Very Good Pre-Owned\u003cbr data-start=\"210\" data-end=\"213\"\u003e\u003cstrong data-start=\"213\" data-end=\"223\"\u003eScope:\u003c\/strong\u003e Box, Papers, and Cards\u003cbr data-start=\"246\" data-end=\"249\"\u003e\u003cstrong data-start=\"249\" data-end=\"258\"\u003eYear:\u003c\/strong\u003e 2025\u003c\/p\u003e\n\u003ch2 data-section-id=\"1xxz1s1\" data-start=\"266\" data-end=\"286\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"269\" data-end=\"286\"\u003e🔎 Case Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"287\" data-end=\"915\"\u003eThe Tudor Black Bay GMT “Opaline” Ref. 79830RB is one of the most compelling modern variations in the Black Bay GMT line — taking the familiar burgundy-and-blue bezel format and pairing it with a bright opaline dial that gives the watch a noticeably sharper, more travel-ready character. The contrast between the dial and the classic “Pepsi” bezel makes this version feel more vivid and more contemporary than the standard black-dial GMT, while still preserving the core Black Bay identity. Tudor introduced the opaline-dial version in 2023, and the bracelet reference is \u003cstrong data-start=\"859\" data-end=\"876\"\u003eM79830RB-0010\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"917\" data-end=\"1642\"\u003eWhat makes this reference especially appealing is that it keeps the Black Bay GMT formula intact while changing the entire feel of the watch. You still get the 41mm steel case, bidirectional 24-hour bezel, manufacture GMT movement, and robust daily-wear build, but the opaline dial adds a brighter, more collector-driven look that stands apart immediately on the wrist. It is a watch that feels equally suited to regular wear and enthusiast attention, which is a hard balance to strike well. Tudor lists the bracelet version with a \u003cstrong data-start=\"1449\" data-end=\"1468\"\u003e41mm steel case\u003c\/strong\u003e, \u003cstrong data-start=\"1470\" data-end=\"1492\"\u003edomed opaline dial\u003c\/strong\u003e, \u003cstrong data-start=\"1494\" data-end=\"1518\"\u003eMT5652 COSC movement\u003c\/strong\u003e, \u003cstrong data-start=\"1520\" data-end=\"1563\"\u003eapproximately 70 hours of power reserve\u003c\/strong\u003e, and \u003cstrong data-start=\"1569\" data-end=\"1603\"\u003e200 meters of water resistance\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1644\" data-end=\"2005\"\u003eThis example dates to 2025 and is presented in very good pre-owned condition, showing only light wear consistent with normal careful use. The case and bracelet show only barely visible wear overall. It includes \u003cstrong data-start=\"1855\" data-end=\"1881\"\u003ebox, papers, and cards\u003c\/strong\u003e and is currently sized to fit approximately a \u003cstrong data-start=\"1928\" data-end=\"1947\"\u003e7.75-inch wrist\u003c\/strong\u003e. The only accessories call-out noted is \u003cstrong data-start=\"1988\" data-end=\"2003\"\u003eno hang tag\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-section-id=\"153bhp\" data-start=\"2007\" data-end=\"2030\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2010\" data-end=\"2030\"\u003e🕰️ The Evidence\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2031\" data-end=\"2630\"\u003e\u003cstrong data-start=\"2031\" data-end=\"2045\"\u003eReference:\u003c\/strong\u003e 79830RB \/ M79830RB-0010\u003cbr data-start=\"2069\" data-end=\"2072\"\u003e\u003cstrong data-start=\"2072\" data-end=\"2082\"\u003eModel:\u003c\/strong\u003e Tudor Black Bay GMT “Opaline”\u003cbr data-start=\"2112\" data-end=\"2115\"\u003e\u003cstrong data-start=\"2115\" data-end=\"2124\"\u003eCase:\u003c\/strong\u003e Stainless Steel\u003cbr data-start=\"2140\" data-end=\"2143\"\u003e\u003cstrong data-start=\"2143\" data-end=\"2157\"\u003eCase Size:\u003c\/strong\u003e 41 mm\u003cbr data-start=\"2163\" data-end=\"2166\"\u003e\u003cstrong data-start=\"2166\" data-end=\"2176\"\u003eBezel:\u003c\/strong\u003e Bidirectional steel bezel with 24-hour graduated matte burgundy and blue anodized aluminum disc\u003cbr data-start=\"2272\" data-end=\"2275\"\u003e\u003cstrong data-start=\"2275\" data-end=\"2287\"\u003eCrystal:\u003c\/strong\u003e Domed Sapphire Crystal\u003cbr data-start=\"2310\" data-end=\"2313\"\u003e\u003cstrong data-start=\"2313\" data-end=\"2322\"\u003eDial:\u003c\/strong\u003e Domed Opaline Dial\u003cbr data-start=\"2341\" data-end=\"2344\"\u003e\u003cstrong data-start=\"2344\" data-end=\"2357\"\u003eMovement:\u003c\/strong\u003e Tudor Manufacture Calibre MT5652 (COSC) Automatic\u003cbr data-start=\"2407\" data-end=\"2410\"\u003e\u003cstrong data-start=\"2410\" data-end=\"2423\"\u003eBracelet:\u003c\/strong\u003e Riveted Stainless Steel Bracelet\u003cbr data-start=\"2456\" data-end=\"2459\"\u003e\u003cstrong data-start=\"2459\" data-end=\"2476\"\u003eBracelet Fit:\u003c\/strong\u003e Approximately 7.75\" wrist\u003cbr data-start=\"2502\" data-end=\"2505\"\u003e\u003cstrong data-start=\"2505\" data-end=\"2526\"\u003eWater Resistance:\u003c\/strong\u003e 200 m\u003cbr data-start=\"2532\" data-end=\"2535\"\u003e\u003cstrong data-start=\"2535\" data-end=\"2544\"\u003eYear:\u003c\/strong\u003e 2025\u003cbr data-start=\"2549\" data-end=\"2552\"\u003e\u003cstrong data-start=\"2552\" data-end=\"2568\" data-is-only-node=\"\"\u003eAccessories:\u003c\/strong\u003e Box, Papers, and Cards \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2632\" data-end=\"2844\"\u003e\u003cstrong data-start=\"2632\" data-end=\"2652\"\u003eCondition Notes:\u003c\/strong\u003e Very good pre-owned condition with only lightly visible wear consistent with normal use. Case and bracelet show barely visible wear overall. No hang tag.\u003c\/p\u003e\n\u003ch2 data-section-id=\"rlu4q3\" data-start=\"2846\" data-end=\"2868\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2849\" data-end=\"2868\"\u003e🌍 GMT Heritage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2869\" data-end=\"3296\"\u003eThe Black Bay GMT takes Tudor’s vintage-inspired dive-watch language and adapts it for travel use, combining the collection’s familiar snowflake-hand design and rotating bezel format with a true GMT architecture built around the in-house MT5652 movement. The result is a watch that still feels unmistakably like a Black Bay, but with the added practicality of tracking multiple time zones. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3298\" data-end=\"3712\"\u003eThe opaline version gives that formula a different personality. Where the original black-dial GMT leans more traditional and tool-like, the opaline dial creates more contrast, more brightness, and a more immediately eye-catching presentation. It feels a bit more distinctive without losing the rugged practicality that made the Black Bay GMT such a success in the first place. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"olqnr0\" data-start=\"3714\" data-end=\"3744\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3717\" data-end=\"3744\"\u003e🌟 Collector Provenance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3745\" data-end=\"4212\"\u003eThe Black Bay GMT has already built a strong following within Tudor’s modern lineup, but the opaline dial has quickly become one of the more desirable executions because it gives the reference a noticeably different look while keeping the same proven platform. For buyers who want the Black Bay GMT experience with a little more presence and a little more differentiation, this is one of the easiest versions to gravitate toward. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"4214\" data-end=\"4582\"\u003eExamples that include \u003cstrong data-start=\"4236\" data-end=\"4262\"\u003ebox, papers, and cards\u003c\/strong\u003e remain the strongest presentation for most buyers, and this one also benefits from a solid bracelet fit. For someone looking for a modern Tudor GMT with strong everyday utility and more visual distinction than the standard black-dial version, this is a very attractive reference.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1i62gsk\" data-start=\"4584\" data-end=\"4614\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"4587\" data-end=\"4614\"\u003e🌟 Celebrity Provenance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"4615\" data-end=\"5029\"\u003eThe Black Bay family has become one of the most recognizable pillars of Tudor’s modern identity, and the GMT line has broadened that appeal by bringing true travel-watch functionality into the collection. The opaline version, in particular, stands out as one of the more enthusiast-driven modern Tudor releases thanks to its contrast-heavy dial and immediate wrist presence. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-section-id=\"1m0aqgo\" data-start=\"5031\" data-end=\"5059\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5034\" data-end=\"5059\"\u003e🧾 From the Case File\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"5060\" data-end=\"5286\"\u003e“Recovered as a 2025 Tudor Black Bay GMT (Opaline) Ref. 79830RB. Box, papers, and cards. Very good pre-owned condition with barely visible wear to the case and bracelet. Sized to approximately a 7.75-inch wrist. No hang tag.”\u003c\/p\u003e\n\u003ch2 data-section-id=\"1tceir8\" data-start=\"5288\" data-end=\"5310\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"5291\" data-end=\"5310\"\u003e🗝️ BST Verdict\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"5311\" data-end=\"5659\"\u003eCase #339 delivers one of the strongest modern Tudor GMT configurations in the lineup. With its opaline dial, classic burgundy-and-blue bezel, box, papers, and cards, and only light honest wear to note, this is a very attractive example of the Black Bay GMT “Opaline.” \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"5661\" data-end=\"5702\"\u003e👉 \u003cstrong data-start=\"5664\" data-end=\"5702\"\u003eEvery case deserves a closer look.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Baker Street Timepieces","offers":[{"title":"Default Title","offer_id":56524679872815,"sku":null,"price":3900.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/5359\/5439\/files\/8F305F2F-9880-4C1C-AE72-9E1F88702585.jpg?v=1775829259","url":"https:\/\/bakerstreettimepieces.com\/products\/case-339-tudor-black-bay-gmt-opaline-ref-79830rb","provider":"Baker Street Timepieces","version":"1.0","type":"link"}